AMS 5520, ASTM A693 Stainless Steel Strip Band SAE 632 S15700 PH15-7Mo

PH 15-7Mo Precipitation Hardening Alloy (S15700, AISI Type 632) is a chromium-nickel-molybdenum-aluminum
semi-austenitic precipitation hardening stainless steel used for applications requiring high strength and a moderate
level of corrosion resistance.

The PH15-7Mo alloy is similar to 17-7PH Precipitation Hardening Alloy (S17700).

The PH15-7Mo alloy is designed with substitution of approximately 2.0 percent molybdenum for 2.0 percent

chromium in the 17-7PH alloy.

This results in somewhat higher room and elevated temperature strength for the S15700 alloy.

The PH15-7Mo alloy has been available for a number of years and has found application in aerospace and

many spring type applications requiring high strength.

The PH15-7Mo precipitation hardening alloy may be formed in a soft austenitic condition and hardened to a high
strength level by low temperature heat treatments. The low temperature heat treatment required for developing high
strength allows minimum distortion compared to conventional quench and temper hardening processes.

Chemical composition %

Product forms

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